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4. Conclusions
Our measurements have shown that even a short-term heating to
specific temperatures of 28–39°C may lead to drastic changes of
thermophysical properties of crude oils, observed at lower ambient
temperatures.
The experimental results indicate also, that the processes at
the above specific temperatures may cause a phase separation in
the crude oil. A comparison with our previous studies allows to
suggest that the specific temperature range is possibly delimited
by: 1) the temperature of a structural phase transition in the as-
phaltene/resin subsystem; 2) the wax appearance temperature.
The observed effects require further investigation from the point of
view of industrially important applications.
Acknowledgements
This study has been financially supported in part by the Founda-
tion for Fundamental Research of the “GASPROM” company
(Grant no. 540–01.3.5). The authors are grateful to B.R. Akhmetov
for conducting the scattering experiments.
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